bad caps in modem power adapter

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  • shovenose
    Send Doge Memes
    • Aug 2010
    • 6575
    • USA
    #1

    bad caps in modem power adapter

    hi everyone!
    one of my clients claimed that the 2wire dsl modem i sold to them (used) was "dead"
    so i took it back and mainwhile they have no internet (but she didnt care as its not crucial to have internet)...
    i went to the local electronics store, who tested the power adapter (which i thought was the problem anyway), and confirmed it was shot. they claimed that it got bad caps (i looked up when i got home that was indeed the problem...
    so they sell me a xicon 25v 1000uf capacitor for 45cents...
    i crack the adapter open and am presented with two probs...
    a. the cap they said was bad visually is ok.
    b. the cap they gave me while being the same size is different (the one in the adapter is a 200v 33uf. are they interchangeable???
    c. two smaller caps are visually bad...
    pictures: coming soon
    Tags: None
    • retiredcaps
      Badcaps Legend
      • Apr 2010
      • 9271
      #2
      Re: bad caps in modem power adapter

      Originally posted by shovenose
      i went to the local electronics store, who tested the power adapter (which i thought was the problem anyway), and confirmed it was shot.
      A multimeter can be used to test any adapter for voltage.

      they claimed that it got bad caps (i looked up when i got home that was indeed the problem...
      Bold statement unless they opened up the adapter and did an ESR test. I mean it could anything bad in the adapter.

      so they sell me a xicon 25v 1000uf capacitor for 45cents...
      i crack the adapter open and am presented with two probs...
      a. the cap they said was bad visually is ok.
      b. the cap they gave me while being the same size is different (the one in the adapter is a 200v 33uf. are they interchangeable???
      c. two smaller caps are visually bad...
      pictures: coming soon
      A 1000uF 25V to replace a 200V 33uF will result in you possibly reaching for the fire extinguisher.

      I suggest you find another electronics store in the future for your requirements.
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        Comment

        • shovenose
          Send Doge Memes
          • Aug 2010
          • 6575
          • USA
          #3
          Re: bad caps in modem power adapter

          Well they have always been right in the past. And theu were right the caps were bad. Im not gonna return a 45cent part... Just gonna add it my misc caps contsiner

            Comment

            • seanc
              Badcaps Legend
              • Nov 2008
              • 1319
              #4
              Re: bad caps in modem power adapter

              I've repaired quite a few 2wire power adapters. IIRC, it was 1000uf 25v that blew in all of them.

              I have one in use and it's working fine at the moment.

                Comment

                • shovenose
                  Send Doge Memes
                  • Aug 2010
                  • 6575
                  • USA
                  #5
                  Re: bad caps in modem power adapter

                  yes thats what they gave me but its actually 2 of the smaller ones---i ditched this im just gonna pick up a used one for $5...hope it doesnt do the same thing

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 31017
                      • Albion
                      #6
                      Re: bad caps in modem power adapter

                      damn, i'v got one of those in use!
                      does it damage the router when it fails?

                        Comment

                        • seanc
                          Badcaps Legend
                          • Nov 2008
                          • 1319
                          #7
                          Re: bad caps in modem power adapter

                          I've never seen any damage to the router STJ, just red light of death. Replace/repair PSU and off you go.

                          There are revised versions of these adapters out, since BT still supply these 2wire routers. I think the revised versions use different colour lettering for the 2wire logo on the PSU.
                          The one I just found has red lettering, I think the revised ones use white.

                          Edit: Just pulled one apart.
                          33uf 400v mains cap.
                          3 x 1000uf 10v smaller caps.
                          Last edited by seanc; 08-28-2010, 12:03 PM.

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